JPS5951699A - Speaker system - Google Patents

Abstract

PURPOSE:To reduce power and to quicken a rise time, by changing a conductance between a sub-box and a cabinet while keeping the inside of the cabinet in a gas and liquid two-phase equilibrium so as to keep a pressure in the cabinet a constant value. CONSTITUTION:Liquids 33, 33' of a freon 113 are put in the cabinet 31 and the sub-box 34. The temperature of the sub-box 34 is kept at a temperature slightly higher than the boiling point 47.6 deg.C of the freon 113 with a heater 36 and the inner pressure is higher than 1atm. Since the cabinet 31 is not temperature- controlled, the temperature is a room temperature and a saturated vapor pressure is lower than 1atm. A pipe 38 connecting the both is provided with a valve 37 having a pressure adjusting mechanism and the vapor in the sub-box 34 is delivered into the cabinet 31 so that the pressure in the cabinet 31 is balanced always with the external pressure. Since the temperature of the cabinet 31 is lower than the boiling point the liquid is condensed eventually and the pressure in the cabinet 31 is balanced to the external pressure at all times by supplying the vapor equal to the condensed amount.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spilker system, and more particularly to a speaker system that is compact and capable of reproducing deep bass by effectively increasing the compliance of a speaker cabinet.

Conventional configurations and their problems In recent years, audio equipment has become smaller and more sophisticated, and speaker systems are also required to be smaller and capable of high-fidelity reproduction. However, in speaker systems using small sealed cabinets, the air inside the cabinet acts as a spring and prevents displacement of the diaphragm, making it impossible to obtain sufficient low-frequency reproduction. For this reason, the emergence of a high-compliance cabinet with soft air springs has been eagerly awaited.

When a liquid is placed in a cabinet and the temperature is maintained at the boiling point of the liquid, the inside of the cabinet is filled with saturated vapor of the liquid and is in equilibrium with the external pressure (1 atm). In such a two-phase equilibrium state, even if the volume inside the cabinet changes due to the displacement of the diaphragm, it is absorbed by the phase transition between the two gas-liquid phases and does not result in a pressure change, making it possible to realize a well-defined, hyphen-prone cabinet.

A conventional example of a speaker system using this principle is shown in FIG. In FIG. 1, a speaker 12 is attached to an airtight cabinet 11, and a liquid 13 of Freon 113 is contained therein. The diaphragm of the speaker is a non-uniform diaphragm using aluminum as the surface material, and the edges are made of a laminate of polyvinylidene chloride and polyurethane sheets to maintain airtightness. The entire system is maintained at the boiling point of Freon 113, 47.6° C., by an external heater 14 wrapped around the cabinet 21.

Further, the inside of the cabinet 21 is lined with an aluminum sintered body 15. This has the purpose of sucking up the liquid 13 by capillary action and widening the exchange area of two gas-liquid phases.

However, the conventional speaker system described above has the following drawbacks. In other words, the temperature control is 10
．． Although precision of 1°C or less is required, it is extremely difficult to maintain a uniform temperature throughout the cabinet due to the distribution of heat capacity and the small size of the heater placed in the front of the cabinet.

In addition, because the heater is placed all over the outside of the cabinet and the insulation material is used, the apparent volume becomes large compared to the effective internal volume. ``There is a contradiction in achieving this. Furthermore, because of its large heat capacity, it had the disadvantage that it took 9 hours to start up until the temperature became uniform.

OBJECTS OF THE INVENTION An object of the present invention is to provide a speaker system that is compact and capable of reproducing deep bass sounds without increasing its apparent volume.

Structure of the Invention In the speaker system of the present invention, instead of controlling the temperature of the entire cabinet, a small chamber provided separately from this cabinet is connected to the cabinet, and the small chamber is placed in the small chamber or in both the small chamber and the cabinet. The temperature inside the cabinet can be controlled to either high or low temperature or both relative to the boiling point of the liquid, and the pressure inside the cabinet can be adjusted by changing the conductance of the pressure-adjustable pulp installed at the connection between the small chamber and the cabinet. It is constructed so that the vapor pressure is equal to the external pressure.

According to this configuration, the above-mentioned conventional drawbacks are avoided and the system has an iconic cabinet.

- It is possible to provide a financial system.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a first embodiment of the invention. In FIG. 2, a liquid 33, 33' of Freon 113 is contained in the cabinet 31 and sub-box 34. The temperature of the sub-box 34 is set to the boiling point of Freon 113 by the heater 3e, 47.
The temperature is kept slightly higher than 6℃, and the internal pressure is higher than 1 atmosphere. Since the cabinet 31 is not temperature controlled, it is at room temperature and the saturated vapor pressure is less than 1 atmosphere. A valve 37 with a pressure adjustment mechanism is provided in a valve 38 connecting the cabinet 31 and the sub-box 34, and the steam inside the sub-box 34 is sent into the cabinet 31 so that the pressure inside the cabinet 31 is always balanced with the external pressure. . Since the temperature of the cabinet 31 is lower than its boiling point, it constantly condenses on the walls, etc., and by feeding steam equal to the amount of condensation, it is possible to always balance the pressure inside the cabinet 31 with the external pressure. If the room temperature changes, the flowmeter of the valve 37 automatically changes accordingly to adjust the pressure. According to this embodiment, it is only necessary to maintain the temperature of the sub-box 34 at a temperature slightly higher than the boiling point.
Does not require precise temperature control.

The pressure inside the cabinet 31 is adjusted by the conductance of the valve 37, and unlike temperature control, controllability is never degraded by response speed or temperature distribution.

FIG. 3 shows the structure of a second embodiment of the present invention. In this embodiment, a 1:1 mixture of Freon 11 and ethanol is used as the liquid 33, 33'. 56 is an electronic cooling device. In the case of a one-component system, the sub-box 34 is always pressurized and only supplies gas to the cabinet 31 unilaterally, but in the case of a two-component system, the sub-box 34 always maintains the inside of the cabinet 31 at 1 atmosphere. Pressurized or depressurized. Since the pressure is adjusted by changing the conductance of the knob 37, there is no need to strictly control the temperature.

FIG. 4 shows the structure of a third embodiment of the invention.

In FIG. 4, cabinet 31. Subbox 34.
34', Id Freon 11 and ethanol tramol ratio = 1
1 and mix FC liquid 33. -33' and 33" are contained in the sub-box 34. The sub-box 34 is heated by the heater 26 and the internal pressure is higher than 1 atm.
It is cooled by an electronic cooling device 56, and the internal pressure is lower than 1 atmosphere.

Therefore, according to the pressure change inside the cabinet 31, the valve 3
7' and 3' and 7' change to maintain the pressure inside the cabinet 31 at 1 atmosphere. By providing two sub-boxes, there is no need to control the temperature of the sub-boxes, and it is only necessary to maintain each sub-box at an appropriate set value.

In the embodiment, the cabinet 31 and the sub-box 34 are drawn separately, but in reality, the sub-box 34 is assembled into a recess 39 provided in a part of the main cabinet 3, as shown in FIG. There is no problem with the design.

As described in detail above, according to the present invention, a sub-box is provided separately from the cabinet main body, and the inside of the cabinet is
i. The pressure inside the cabinet can be kept constant by changing the conductance between the sub-box and the cabinet while maintaining two-phase equilibrium, which requires less electricity than controlling the temperature of an entire large cabinet. It also has the advantage of fast rise time. When pressure is controlled by the conductance of a valve, the response speed is faster than when it is controlled by temperature, and there is no need to control the temperature of the subbox at a constant level, and the pressure inside the subbox is always less than 1 atm. Since it is sufficient to set the temperature so that the temperature is high, a temperature controller is not required. Also, when using a two-component system and controlling the pressure with the conductance of the valve, heating,
By incorporating a mechanism that enables both cooling into the sub-box, strict temperature control is no longer necessary.Moreover, when using a two-component system and controlling the pressure by the conductance of the valve, it is possible to use two sub-boxes and use one of the sub-boxes. heating.

By cooling the other side, there is an advantage that a temperature controller for the subbox is not required.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional example of a high compliance cabinet using two-phase equilibrium, and Figs. 2, 3, 4, and 5 are high compliance cabinets showing an embodiment of the present invention. FIG. 31...Cabinet, 32...Speaker, 33.33', 33"...Liquid, 36.
...-Heater, 34...Sub box,
36... Connection tube, 38... Gas and liquid transfer tube, 37, 37'...
Pressure □ Force adjustment valve, 66...Electronic cooling device. Name of agent: Patent attorney Toshio Nakao and 1 other person1
□ Figure 1 Figure 2 Figure 3 Figure 4 Figure 6

Claims (1)

[Scope of Claims] (1) It has an airtight cabinet in which a speaker unit is attached and a small chamber connected to this cabinet, and a liquid consisting of one or more components is filled in the small chamber or in both the small chamber and the cabinet. The temperature of the small chamber can be controlled to be either high or low, or both, relative to the boiling point of the liquid, and the temperature of the small chamber can be controlled to be either high or low, or both, and the cabinet can be heated by changing the conductance of a pressure-adjustable valve provided at the connection between the small chamber and the cabinet. A speaker system characterized in that the internal pressure is equal to the external pressure due to the vapor pressure of the liquid. (2) The chamber and the cabinet are connected in at least two places, one of which serves to return the liquid in the cabinet to the chamber, and the other with a pressure-adjustable valve. The speaker system according to claim 1, characterized in that: (3) The speaker system according to claim 1 or 2, characterized in that the pressure inside the small chamber is always higher than the outside pressure. (4) The liquid comprises a plurality of components, and the temperature of the small chamber can be controlled to be higher or lower than the boiling point of the liquid. speaker system. (6) Two small chambers are provided, and each of the small chambers is connected to the cabinet via a pressure-adjustable valve. The speaker system 0 according to claim 1 or 2, wherein the speaker system 0 is configured such that the temperature is controlled to be higher than the boiling point of the liquid, and the other temperature is lower than the boiling point of the liquid.